builtin-update-index.c

   1 /*
   2  * GIT - The information manager from hell
   3  *
   4  * Copyright (C) Linus Torvalds, 2005
   5  */
   6 #include "cache.h"
   7 #include "strbuf.h"
   8 #include "quote.h"
   9 #include "cache-tree.h"
  10 #include "tree-walk.h"
  11 #include "builtin.h"
  12 #include "refs.h"
  13
  14 /*
  15  * Default to not allowing changes to the list of files. The
  16  * tool doesn't actually care, but this makes it harder to add
  17  * files to the revision control by mistake by doing something
  18  * like "git-update-index *" and suddenly having all the object
  19  * files be revision controlled.
  20  */
  21 static int allow_add;
  22 static int allow_remove;
  23 static int allow_replace;
  24 static int info_only;
  25 static int force_remove;
  26 static int verbose;
  27 static int mark_valid_only;
  28 #define MARK_VALID 1
  29 #define UNMARK_VALID 2
  30
  31 static void report(const char *fmt, ...)
  32 {
  33         va_list vp;
  34
  35         if (!verbose)
  36                 return;
  37
  38         va_start(vp, fmt);
  39         vprintf(fmt, vp);
  40         putchar('\n');
  41         va_end(vp);
  42 }
  43
  44 static int mark_valid(const char *path)
  45 {
  46         int namelen = strlen(path);
  47         int pos = cache_name_pos(path, namelen);
  48         if (0 <= pos) {
  49                 switch (mark_valid_only) {
  50                 case MARK_VALID:
  51                         active_cache[pos]->ce_flags |= htons(CE_VALID);
  52                         break;
  53                 case UNMARK_VALID:
  54                         active_cache[pos]->ce_flags &= ~htons(CE_VALID);
  55                         break;
  56                 }
  57                 cache_tree_invalidate_path(active_cache_tree, path);
  58                 active_cache_changed = 1;
  59                 return 0;
  60         }
  61         return -1;
  62 }
  63
  64 static int remove_one_path(const char *path)
  65 {
  66         if (!allow_remove)
  67                 return error("%s: does not exist and --remove not passed", path);
  68         if (remove_file_from_cache(path))
  69                 return error("%s: cannot remove from the index", path);
  70         return 0;
  71 }
  72
  73 /*
  74  * Handle a path that couldn't be lstat'ed. It's either:
  75  *  - missing file (ENOENT or ENOTDIR). That's ok if we're
  76  *    supposed to be removing it and the removal actually
  77  *    succeeds.
  78  *  - permission error. That's never ok.
  79  */
  80 static int process_lstat_error(const char *path, int err)
  81 {
  82         if (err == ENOENT || err == ENOTDIR)
  83                 return remove_one_path(path);
  84         return error("lstat(\"%s\"): %s", path, strerror(errno));
  85 }
  86
  87 static int add_one_path(struct cache_entry *old, const char *path, int len, struct stat *st)
  88 {
  89         int option, size;
  90         struct cache_entry *ce;
  91
  92         /* Was the old index entry already up-to-date? */
  93         if (old && !ce_stage(old) && !ce_match_stat(old, st, 0))
  94                 return 0;
  95
  96         size = cache_entry_size(len);
  97         ce = xcalloc(1, size);
  98         memcpy(ce->name, path, len);
  99         ce->ce_flags = htons(len);
 100         fill_stat_cache_info(ce, st);
 101         ce->ce_mode = ce_mode_from_stat(old, st->st_mode);
 102
 103         if (index_path(ce->sha1, path, st, !info_only))
 104                 return -1;
 105         option = allow_add ? ADD_CACHE_OK_TO_ADD : 0;
 106         option |= allow_replace ? ADD_CACHE_OK_TO_REPLACE : 0;
 107         if (add_cache_entry(ce, option))
 108                 return error("%s: cannot add to the index - missing --add option?", path);
 109         return 0;
 110 }
 111
 112 /*
 113  * Handle a path that was a directory. Four cases:
 114  *
 115  *  - it's already a gitlink in the index, and we keep it that
 116  *    way, and update it if we can (if we cannot find the HEAD,
 117  *    we're going to keep it unchanged in the index!)
 118  *
 119  *  - it's a *file* in the index, in which case it should be
 120  *    removed as a file if removal is allowed, since it doesn't
 121  *    exist as such any more. If removal isn't allowed, it's
 122  *    an error.
 123  *
 124  *    (NOTE! This is old and arguably fairly strange behaviour.
 125  *    We might want to make this an error unconditionally, and
 126  *    use "--force-remove" if you actually want to force removal).
 127  *
 128  *  - it used to exist as a subdirectory (ie multiple files with
 129  *    this particular prefix) in the index, in which case it's wrong
 130  *    to try to update it as a directory.
 131  *
 132  *  - it doesn't exist at all in the index, but it is a valid
 133  *    git directory, and it should be *added* as a gitlink.
 134  */
 135 static int process_directory(const char *path, int len, struct stat *st)
 136 {
 137         unsigned char sha1[20];
 138         int pos = cache_name_pos(path, len);
 139
 140         /* Exact match: file or existing gitlink */
 141         if (pos >= 0) {
 142                 struct cache_entry *ce = active_cache[pos];
 143                 if (S_ISGITLINK(ntohl(ce->ce_mode))) {
 144
 145                         /* Do nothing to the index if there is no HEAD! */
 146                         if (resolve_gitlink_ref(path, "HEAD", sha1) < 0)
 147                                 return 0;
 148
 149                         return add_one_path(ce, path, len, st);
 150                 }
 151                 /* Should this be an unconditional error? */
 152                 return remove_one_path(path);
 153         }
 154
 155         /* Inexact match: is there perhaps a subdirectory match? */
 156         pos = -pos-1;
 157         while (pos < active_nr) {
 158                 struct cache_entry *ce = active_cache[pos++];
 159
 160                 if (strncmp(ce->name, path, len))
 161                         break;
 162                 if (ce->name[len] > '/')
 163                         break;
 164                 if (ce->name[len] < '/')
 165                         continue;
 166
 167                 /* Subdirectory match - error out */
 168                 return error("%s: is a directory - add individual files instead", path);
 169         }
 170
 171         /* No match - should we add it as a gitlink? */
 172         if (!resolve_gitlink_ref(path, "HEAD", sha1))
 173                 return add_one_path(NULL, path, len, st);
 174
 175         /* Error out. */
 176         return error("%s: is a directory - add files inside instead", path);
 177 }
 178
 179 /*
 180  * Process a regular file
 181  */
 182 static int process_file(const char *path, int len, struct stat *st)
 183 {
 184         int pos = cache_name_pos(path, len);
 185         struct cache_entry *ce = pos < 0 ? NULL : active_cache[pos];
 186
 187         if (ce && S_ISGITLINK(ntohl(ce->ce_mode)))
 188                 return error("%s is already a gitlink, not replacing", path);
 189
 190         return add_one_path(ce, path, len, st);
 191 }
 192
 193 static int process_path(const char *path)
 194 {
 195         int len;
 196         struct stat st;
 197
 198         /* We probably want to do this in remove_file_from_cache() and
 199          * add_cache_entry() instead...
 200          */
 201         cache_tree_invalidate_path(active_cache_tree, path);
 202
 203         /*
 204          * First things first: get the stat information, to decide
 205          * what to do about the pathname!
 206          */
 207         if (lstat(path, &st) < 0)
 208                 return process_lstat_error(path, errno);
 209
 210         len = strlen(path);
 211         if (S_ISDIR(st.st_mode))
 212                 return process_directory(path, len, &st);
 213
 214         return process_file(path, len, &st);
 215 }
 216
 217 static int add_cacheinfo(unsigned int mode, const unsigned char *sha1,
 218                          const char *path, int stage)
 219 {
 220         int size, len, option;
 221         struct cache_entry *ce;
 222
 223         if (!verify_path(path))
 224                 return -1;
 225
 226         len = strlen(path);
 227         size = cache_entry_size(len);
 228         ce = xcalloc(1, size);
 229
 230         hashcpy(ce->sha1, sha1);
 231         memcpy(ce->name, path, len);
 232         ce->ce_flags = create_ce_flags(len, stage);
 233         ce->ce_mode = create_ce_mode(mode);
 234         if (assume_unchanged)
 235                 ce->ce_flags |= htons(CE_VALID);
 236         option = allow_add ? ADD_CACHE_OK_TO_ADD : 0;
 237         option |= allow_replace ? ADD_CACHE_OK_TO_REPLACE : 0;
 238         if (add_cache_entry(ce, option))
 239                 return error("%s: cannot add to the index - missing --add option?",
 240                              path);
 241         report("add '%s'", path);
 242         cache_tree_invalidate_path(active_cache_tree, path);
 243         return 0;
 244 }
 245
 246 static void chmod_path(int flip, const char *path)
 247 {
 248         int pos;
 249         struct cache_entry *ce;
 250         unsigned int mode;
 251
 252         pos = cache_name_pos(path, strlen(path));
 253         if (pos < 0)
 254                 goto fail;
 255         ce = active_cache[pos];
 256         mode = ntohl(ce->ce_mode);
 257         if (!S_ISREG(mode))
 258                 goto fail;
 259         switch (flip) {
 260         case '+':
 261                 ce->ce_mode |= htonl(0111); break;
 262         case '-':
 263                 ce->ce_mode &= htonl(~0111); break;
 264         default:
 265                 goto fail;
 266         }
 267         cache_tree_invalidate_path(active_cache_tree, path);
 268         active_cache_changed = 1;
 269         report("chmod %cx '%s'", flip, path);
 270         return;
 271  fail:
 272         die("git-update-index: cannot chmod %cx '%s'", flip, path);
 273 }
 274
 275 static void update_one(const char *path, const char *prefix, int prefix_length)
 276 {
 277         const char *p = prefix_path(prefix, prefix_length, path);
 278         if (!verify_path(p)) {
 279                 fprintf(stderr, "Ignoring path %s\n", path);
 280                 goto free_return;
 281         }
 282         if (mark_valid_only) {
 283                 if (mark_valid(p))
 284                         die("Unable to mark file %s", path);
 285                 goto free_return;
 286         }
 287         cache_tree_invalidate_path(active_cache_tree, path);
 288
 289         if (force_remove) {
 290                 if (remove_file_from_cache(p))
 291                         die("git-update-index: unable to remove %s", path);
 292                 report("remove '%s'", path);
 293                 goto free_return;
 294         }
 295         if (process_path(p))
 296                 die("Unable to process path %s", path);
 297         report("add '%s'", path);
 298  free_return:
 299         if (p < path || p > path + strlen(path))
 300                 free((char*)p);
 301 }
 302
 303 static void read_index_info(int line_termination)
 304 {
 305         struct strbuf buf;
 306         strbuf_init(&buf);
 307         while (1) {
 308                 char *ptr, *tab;
 309                 char *path_name;
 310                 unsigned char sha1[20];
 311                 unsigned int mode;
 312                 unsigned long ul;
 313                 int stage;
 314
 315                 /* This reads lines formatted in one of three formats:
 316                  *
 317                  * (1) mode         SP sha1          TAB path
 318                  * The first format is what "git-apply --index-info"
 319                  * reports, and used to reconstruct a partial tree
 320                  * that is used for phony merge base tree when falling
 321                  * back on 3-way merge.
 322                  *
 323                  * (2) mode SP type SP sha1          TAB path
 324                  * The second format is to stuff git-ls-tree output
 325                  * into the index file.
 326                  *
 327                  * (3) mode         SP sha1 SP stage TAB path
 328                  * This format is to put higher order stages into the
 329                  * index file and matches git-ls-files --stage output.
 330                  */
 331                 read_line(&buf, stdin, line_termination);
 332                 if (buf.eof)
 333                         break;
 334
 335                 errno = 0;
 336                 ul = strtoul(buf.buf, &ptr, 8);
 337                 if (ptr == buf.buf || *ptr != ' '
 338                     || errno || (unsigned int) ul != ul)
 339                         goto bad_line;
 340                 mode = ul;
 341
 342                 tab = strchr(ptr, '\t');
 343                 if (!tab || tab - ptr < 41)
 344                         goto bad_line;
 345
 346                 if (tab[-2] == ' ' && '0' <= tab[-1] && tab[-1] <= '3') {
 347                         stage = tab[-1] - '0';
 348                         ptr = tab + 1; /* point at the head of path */
 349                         tab = tab - 2; /* point at tail of sha1 */
 350                 }
 351                 else {
 352                         stage = 0;
 353                         ptr = tab + 1; /* point at the head of path */
 354                 }
 355
 356                 if (get_sha1_hex(tab - 40, sha1) || tab[-41] != ' ')
 357                         goto bad_line;
 358
 359                 if (line_termination && ptr[0] == '"')
 360                         path_name = unquote_c_style(ptr, NULL);
 361                 else
 362                         path_name = ptr;
 363
 364                 if (!verify_path(path_name)) {
 365                         fprintf(stderr, "Ignoring path %s\n", path_name);
 366                         if (path_name != ptr)
 367                                 free(path_name);
 368                         continue;
 369                 }
 370                 cache_tree_invalidate_path(active_cache_tree, path_name);
 371
 372                 if (!mode) {
 373                         /* mode == 0 means there is no such path -- remove */
 374                         if (remove_file_from_cache(path_name))
 375                                 die("git-update-index: unable to remove %s",
 376                                     ptr);
 377                 }
 378                 else {
 379                         /* mode ' ' sha1 '\t' name
 380                          * ptr[-1] points at tab,
 381                          * ptr[-41] is at the beginning of sha1
 382                          */
 383                         ptr[-42] = ptr[-1] = 0;
 384                         if (add_cacheinfo(mode, sha1, path_name, stage))
 385                                 die("git-update-index: unable to update %s",
 386                                     path_name);
 387                 }
 388                 if (path_name != ptr)
 389                         free(path_name);
 390                 continue;
 391
 392         bad_line:
 393                 die("malformed index info %s", buf.buf);
 394         }
 395 }
 396
 397 static const char update_index_usage[] =
 398 "git-update-index [-q] [--add] [--replace] [--remove] [--unmerged] [--refresh] [--really-refresh] [--cacheinfo] [--chmod=(+|-)x] [--assume-unchanged] [--info-only] [--force-remove] [--stdin] [--index-info] [--unresolve] [--again | -g] [--ignore-missing] [-z] [--verbose] [--] <file>...";
 399
 400 static unsigned char head_sha1[20];
 401 static unsigned char merge_head_sha1[20];
 402
 403 static struct cache_entry *read_one_ent(const char *which,
 404                                         unsigned char *ent, const char *path,
 405                                         int namelen, int stage)
 406 {
 407         unsigned mode;
 408         unsigned char sha1[20];
 409         int size;
 410         struct cache_entry *ce;
 411
 412         if (get_tree_entry(ent, path, sha1, &mode)) {
 413                 if (which)
 414                         error("%s: not in %s branch.", path, which);
 415                 return NULL;
 416         }
 417         if (mode == S_IFDIR) {
 418                 if (which)
 419                         error("%s: not a blob in %s branch.", path, which);
 420                 return NULL;
 421         }
 422         size = cache_entry_size(namelen);
 423         ce = xcalloc(1, size);
 424
 425         hashcpy(ce->sha1, sha1);
 426         memcpy(ce->name, path, namelen);
 427         ce->ce_flags = create_ce_flags(namelen, stage);
 428         ce->ce_mode = create_ce_mode(mode);
 429         return ce;
 430 }
 431
 432 static int unresolve_one(const char *path)
 433 {
 434         int namelen = strlen(path);
 435         int pos;
 436         int ret = 0;
 437         struct cache_entry *ce_2 = NULL, *ce_3 = NULL;
 438
 439         /* See if there is such entry in the index. */
 440         pos = cache_name_pos(path, namelen);
 441         if (pos < 0) {
 442                 /* If there isn't, either it is unmerged, or
 443                  * resolved as "removed" by mistake.  We do not
 444                  * want to do anything in the former case.
 445                  */
 446                 pos = -pos-1;
 447                 if (pos < active_nr) {
 448                         struct cache_entry *ce = active_cache[pos];
 449                         if (ce_namelen(ce) == namelen &&
 450                             !memcmp(ce->name, path, namelen)) {
 451                                 fprintf(stderr,
 452                                         "%s: skipping still unmerged path.\n",
 453                                         path);
 454                                 goto free_return;
 455                         }
 456                 }
 457         }
 458
 459         /* Grab blobs from given path from HEAD and MERGE_HEAD,
 460          * stuff HEAD version in stage #2,
 461          * stuff MERGE_HEAD version in stage #3.
 462          */
 463         ce_2 = read_one_ent("our", head_sha1, path, namelen, 2);
 464         ce_3 = read_one_ent("their", merge_head_sha1, path, namelen, 3);
 465
 466         if (!ce_2 || !ce_3) {
 467                 ret = -1;
 468                 goto free_return;
 469         }
 470         if (!hashcmp(ce_2->sha1, ce_3->sha1) &&
 471             ce_2->ce_mode == ce_3->ce_mode) {
 472                 fprintf(stderr, "%s: identical in both, skipping.\n",
 473                         path);
 474                 goto free_return;
 475         }
 476
 477         cache_tree_invalidate_path(active_cache_tree, path);
 478         remove_file_from_cache(path);
 479         if (add_cache_entry(ce_2, ADD_CACHE_OK_TO_ADD)) {
 480                 error("%s: cannot add our version to the index.", path);
 481                 ret = -1;
 482                 goto free_return;
 483         }
 484         if (!add_cache_entry(ce_3, ADD_CACHE_OK_TO_ADD))
 485                 return 0;
 486         error("%s: cannot add their version to the index.", path);
 487         ret = -1;
 488  free_return:
 489         free(ce_2);
 490         free(ce_3);
 491         return ret;
 492 }
 493
 494 static void read_head_pointers(void)
 495 {
 496         if (read_ref("HEAD", head_sha1))
 497                 die("No HEAD -- no initial commit yet?\n");
 498         if (read_ref("MERGE_HEAD", merge_head_sha1)) {
 499                 fprintf(stderr, "Not in the middle of a merge.\n");
 500                 exit(0);
 501         }
 502 }
 503
 504 static int do_unresolve(int ac, const char **av,
 505                         const char *prefix, int prefix_length)
 506 {
 507         int i;
 508         int err = 0;
 509
 510         /* Read HEAD and MERGE_HEAD; if MERGE_HEAD does not exist, we
 511          * are not doing a merge, so exit with success status.
 512          */
 513         read_head_pointers();
 514
 515         for (i = 1; i < ac; i++) {
 516                 const char *arg = av[i];
 517                 const char *p = prefix_path(prefix, prefix_length, arg);
 518                 err |= unresolve_one(p);
 519                 if (p < arg || p > arg + strlen(arg))
 520                         free((char*)p);
 521         }
 522         return err;
 523 }
 524
 525 static int do_reupdate(int ac, const char **av,
 526                        const char *prefix, int prefix_length)
 527 {
 528         /* Read HEAD and run update-index on paths that are
 529          * merged and already different between index and HEAD.
 530          */
 531         int pos;
 532         int has_head = 1;
 533         const char **pathspec = get_pathspec(prefix, av + 1);
 534
 535         if (read_ref("HEAD", head_sha1))
 536                 /* If there is no HEAD, that means it is an initial
 537                  * commit.  Update everything in the index.
 538                  */
 539                 has_head = 0;
 540  redo:
 541         for (pos = 0; pos < active_nr; pos++) {
 542                 struct cache_entry *ce = active_cache[pos];
 543                 struct cache_entry *old = NULL;
 544                 int save_nr;
 545
 546                 if (ce_stage(ce) || !ce_path_match(ce, pathspec))
 547                         continue;
 548                 if (has_head)
 549                         old = read_one_ent(NULL, head_sha1,
 550                                            ce->name, ce_namelen(ce), 0);
 551                 if (old && ce->ce_mode == old->ce_mode &&
 552                     !hashcmp(ce->sha1, old->sha1)) {
 553                         free(old);
 554                         continue; /* unchanged */
 555                 }
 556                 /* Be careful.  The working tree may not have the
 557                  * path anymore, in which case, under 'allow_remove',
 558                  * or worse yet 'allow_replace', active_nr may decrease.
 559                  */
 560                 save_nr = active_nr;
 561                 update_one(ce->name + prefix_length, prefix, prefix_length);
 562                 if (save_nr != active_nr)
 563                         goto redo;
 564         }
 565         return 0;
 566 }
 567
 568 int cmd_update_index(int argc, const char **argv, const char *prefix)
 569 {
 570         int i, newfd, entries, has_errors = 0, line_termination = '\n';
 571         int allow_options = 1;
 572         int read_from_stdin = 0;
 573         int prefix_length = prefix ? strlen(prefix) : 0;
 574         char set_executable_bit = 0;
 575         unsigned int refresh_flags = 0;
 576         int lock_error = 0;
 577         struct lock_file *lock_file;
 578
 579         git_config(git_default_config);
 580
 581         /* We can't free this memory, it becomes part of a linked list parsed atexit() */
 582         lock_file = xcalloc(1, sizeof(struct lock_file));
 583
 584         newfd = hold_locked_index(lock_file, 0);
 585         if (newfd < 0)
 586                 lock_error = errno;
 587
 588         entries = read_cache();
 589         if (entries < 0)
 590                 die("cache corrupted");
 591
 592         for (i = 1 ; i < argc; i++) {
 593                 const char *path = argv[i];
 594                 const char *p;
 595
 596                 if (allow_options && *path == '-') {
 597                         if (!strcmp(path, "--")) {
 598                                 allow_options = 0;
 599                                 continue;
 600                         }
 601                         if (!strcmp(path, "-q")) {
 602                                 refresh_flags |= REFRESH_QUIET;
 603                                 continue;
 604                         }
 605                         if (!strcmp(path, "--add")) {
 606                                 allow_add = 1;
 607                                 continue;
 608                         }
 609                         if (!strcmp(path, "--replace")) {
 610                                 allow_replace = 1;
 611                                 continue;
 612                         }
 613                         if (!strcmp(path, "--remove")) {
 614                                 allow_remove = 1;
 615                                 continue;
 616                         }
 617                         if (!strcmp(path, "--unmerged")) {
 618                                 refresh_flags |= REFRESH_UNMERGED;
 619                                 continue;
 620                         }
 621                         if (!strcmp(path, "--refresh")) {
 622                                 has_errors |= refresh_cache(refresh_flags);
 623                                 continue;
 624                         }
 625                         if (!strcmp(path, "--really-refresh")) {
 626                                 has_errors |= refresh_cache(REFRESH_REALLY | refresh_flags);
 627                                 continue;
 628                         }
 629                         if (!strcmp(path, "--cacheinfo")) {
 630                                 unsigned char sha1[20];
 631                                 unsigned int mode;
 632
 633                                 if (i+3 >= argc)
 634                                         die("git-update-index: --cacheinfo <mode> <sha1> <path>");
 635
 636                                 if (strtoul_ui(argv[i+1], 8, &mode) ||
 637                                     get_sha1_hex(argv[i+2], sha1) ||
 638                                     add_cacheinfo(mode, sha1, argv[i+3], 0))
 639                                         die("git-update-index: --cacheinfo"
 640                                             " cannot add %s", argv[i+3]);
 641                                 i += 3;
 642                                 continue;
 643                         }
 644                         if (!strcmp(path, "--chmod=-x") ||
 645                             !strcmp(path, "--chmod=+x")) {
 646                                 if (argc <= i+1)
 647                                         die("git-update-index: %s <path>", path);
 648                                 set_executable_bit = path[8];
 649                                 continue;
 650                         }
 651                         if (!strcmp(path, "--assume-unchanged")) {
 652                                 mark_valid_only = MARK_VALID;
 653                                 continue;
 654                         }
 655                         if (!strcmp(path, "--no-assume-unchanged")) {
 656                                 mark_valid_only = UNMARK_VALID;
 657                                 continue;
 658                         }
 659                         if (!strcmp(path, "--info-only")) {
 660                                 info_only = 1;
 661                                 continue;
 662                         }
 663                         if (!strcmp(path, "--force-remove")) {
 664                                 force_remove = 1;
 665                                 continue;
 666                         }
 667                         if (!strcmp(path, "-z")) {
 668                                 line_termination = 0;
 669                                 continue;
 670                         }
 671                         if (!strcmp(path, "--stdin")) {
 672                                 if (i != argc - 1)
 673                                         die("--stdin must be at the end");
 674                                 read_from_stdin = 1;
 675                                 break;
 676                         }
 677                         if (!strcmp(path, "--index-info")) {
 678                                 if (i != argc - 1)
 679                                         die("--index-info must be at the end");
 680                                 allow_add = allow_replace = allow_remove = 1;
 681                                 read_index_info(line_termination);
 682                                 break;
 683                         }
 684                         if (!strcmp(path, "--unresolve")) {
 685                                 has_errors = do_unresolve(argc - i, argv + i,
 686                                                           prefix, prefix_length);
 687                                 if (has_errors)
 688                                         active_cache_changed = 0;
 689                                 goto finish;
 690                         }
 691                         if (!strcmp(path, "--again") || !strcmp(path, "-g")) {
 692                                 has_errors = do_reupdate(argc - i, argv + i,
 693                                                          prefix, prefix_length);
 694                                 if (has_errors)
 695                                         active_cache_changed = 0;
 696                                 goto finish;
 697                         }
 698                         if (!strcmp(path, "--ignore-missing")) {
 699                                 refresh_flags |= REFRESH_IGNORE_MISSING;
 700                                 continue;
 701                         }
 702                         if (!strcmp(path, "--verbose")) {
 703                                 verbose = 1;
 704                                 continue;
 705                         }
 706                         if (!strcmp(path, "-h") || !strcmp(path, "--help"))
 707                                 usage(update_index_usage);
 708                         die("unknown option %s", path);
 709                 }
 710                 p = prefix_path(prefix, prefix_length, path);
 711                 update_one(p, NULL, 0);
 712                 if (set_executable_bit)
 713                         chmod_path(set_executable_bit, p);
 714                 if (p < path || p > path + strlen(path))
 715                         free((char*)p);
 716         }
 717         if (read_from_stdin) {
 718                 struct strbuf buf;
 719                 strbuf_init(&buf);
 720                 while (1) {
 721                         char *path_name;
 722                         const char *p;
 723                         read_line(&buf, stdin, line_termination);
 724                         if (buf.eof)
 725                                 break;
 726                         if (line_termination && buf.buf[0] == '"')
 727                                 path_name = unquote_c_style(buf.buf, NULL);
 728                         else
 729                                 path_name = buf.buf;
 730                         p = prefix_path(prefix, prefix_length, path_name);
 731                         update_one(p, NULL, 0);
 732                         if (set_executable_bit)
 733                                 chmod_path(set_executable_bit, p);
 734                         if (p < path_name || p > path_name + strlen(path_name))
 735                                 free((char*) p);
 736                         if (path_name != buf.buf)
 737                                 free(path_name);
 738                 }
 739         }
 740
 741  finish:
 742         if (active_cache_changed) {
 743                 if (newfd < 0) {
 744                         if (refresh_flags & REFRESH_QUIET)
 745                                 exit(128);
 746                         die("unable to create '%s.lock': %s",
 747                             get_index_file(), strerror(lock_error));
 748                 }
 749                 if (write_cache(newfd, active_cache, active_nr) ||
 750                     close(newfd) || commit_locked_index(lock_file))
 751                         die("Unable to write new index file");
 752         }
 753
 754         rollback_lock_file(lock_file);
 755
 756         return has_errors ? 1 : 0;
 757 }